SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Boyu Du,Yumeng Wang,Qian Zheng,Xing Wang,Xiaohong Chen,Jinghui Zhou,Guihua Yang,Run-Cang Sun
The development of eco-friendliness and cost-effectiveness featured lignin-based adsorbents is of great interest for the removal of organic dyes and heavy metal ions. In this work, lignin was modified by 5-sulfosalicylic acid using epichlorohydrin and formaldehyde as across-linking agents. Then the prepared lignin product (C-SAL) was applied as an adsorbent for the malachite green (MG) and Pb 2+ ions, and the adsorption performances were investigated in detail via a series of experiments. The isotherm and kinetic models indicated that the chem-adsorption for both MG and Pb 2+ ions occurred in monolayer, and the thermodynamic models displayed that all processes were endothermic and spontaneous. Based on the calculation, the maximum adsorption capacities (Q max ) of C-SAL could achieve 203.45 and 115.67 mg/g for MG and Pb 2+ ions, respectively, which are superior to many other biomass-based adsorbents. Besides, 94.52 % and 88.27 % of initial adsorption capacities could be retained after eight cycles for MG and Pb 2+ ions, respectively. Additionally, the adsorption mechanism was also comprehensively investigated by the structural change characterizations, MESP analysis and DFT calculations. The results showed that the adsorption for MG molecules took place through electrostatic, hydrogen bonding and π-π interactions, while that for Pb 2+ ions was attributed to the synergistic effect of complexation, hydrogen bonding and electrostatic interactions. In summary, C-SAL has the advantages of satisfied adsorption capacity and good recyclability, which can provide a low-cost and high-efficiency way for adsorptions of pollutants in practical applications.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 10
·9585-9597
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IF 2.76
Yang Xueting,Zheng Jinzhao,Lu Yongming,Jia Rong
Malachite green (MG), a recalcitrant, carcinogenic, and mutagenic triphenylmethane dye, was decolorized and detoxified using crude manganese peroxidase (MnP) prepared from the white rot fungus Irpex lacteus F17. In this study, the key factors (pH, temperature, MG, Mn 2+ , H 2 O 2 , MnP) in these processes were investigated. Under optimal conditions, 96 % of 200 mg L −1 of MG was decolorized when 66.32 U L −1 of MnP was added for 1 h. The K
m , V
max , and k
cat values were 109.9 μmol L −1 , 152.8 μmol L −1 min −1 , and 44.5 s −1 , respectively. The decolorization of MG by MnP followed first-order reaction kinetics with a kinetic rate constant of 0.0129 h −1 . UV–vis and UPLC analysis revealed degradation of MG. Furthermore, seven different intermediates formed during the MnP treatment of 0.5 h were identified by LC-TOF-MS. These degradation products were generated via two different routes by either N -demethylation of MG or the oxidative cleavage of the C–C double bond in MG. Based on ecotoxicity analyses performed on bacteria and algae, it was confirmed that MG metabolites produced by the MnP-catalyzed system were appreciably less toxic than the parent compound. These studies indicate the potential use of this enzyme system in the clean-up of aquatic and terrestrial environments.
研究领域:
环境科学
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生物化学
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DOI
PubMed
高影响因子
CHINESE CHEMICAL LETTERS
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2018
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IF 2.631
Jun Chen,Jing Zhan,Yumeng Zhang,Yiwei Tang
A novel ZnCo 2 O 4 /Bi 2 O 3 heterojunction photocatalyst was prepared, and the formation of the heterojunction was confirmed via HRTEM . Photocatalytic activity of as-prepared samples was evaluated through photodegradation of malachite green (MG). The degradation results show that the as-prepared 13% ZnCo 2 O 4 /Bi 2 O 3 heterojunction photocatalyst exhibits higher activity than pure Bi 2 O 3 . The MG degradation rate for the as-prepared catalyst is as high as 94%. The enhanced photocatalytic activity is mainly attributed to the broad photoabsorption and low recombination rate of photogenerated electron-hole pairs, which is driven by the photogenerated potential difference formed at the ZnCo 2 O 4 /Bi 2 O 3 heterojunction interface.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
FOOD CHEMISTRY
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2017
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IF 4.529
Le Wu,Zheng-zhong Lin,Hui-ping Zhong,Ai-hong Peng,Xiao-mei Chen,Zhi-yong Huang
A sensitive fluorescence sensor for the detection of malachite green (MG) was fabricated by grafting molecularly imprinted polymers (MIPs) onto the surface of CdTe quantum dots (QDs). The MIP-coated QDs were synthesized via a reverse microemulsion method using (3-aminopropyl)triethoxysilane (APTES) and tetraethyl orthosilicate (TEOS) as functional monomer and cross-linker, respectively. The optimum molar ratio of MG, functional monomer and cross-linker was 1:3:10. The MIP-coated QDs exhibited uniform spheres with diameter around 49 nm and excellent fluorescence emission at λ ex 370 nm. A linear relationship with two segments between the relative fluorescence intensities and the MG concentrations ranging from 0.08 to 20 μmol·L −1 could be obtained with a detection limit of 12 μg·kg −1 . The fluorescent probe was successfully applied to the determination of MG in fish samples with the spiked recoveries ranging from 94.3% to 109.5% which were in accordance with those of the measurement by HPLC-UV.
研究领域:
分析化学
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环境科学
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食品安全
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2016
·Vol. 16
·期 1
·892-897
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IF 1.338
Tripathi Pranav K.,Gan Lihua,Liu Mingxian
In this work, we have synthesized high surface area and large pore volume carbon nanoparticles (CNP) by a simple and easy sol–gel approach. The sol was prepared by mixing Pluronic F127 and phloroglucinol-terephthalaldehyde in acidic ethanol solution and the gel was formed after
the vacuum removal of ethanol. In the sol–gel process, hydrophobic segments of Pluronic F127 forms enhanced hydrogen bonding with trihydroxyl groups of phloroglucinol. A polymeric network of carbon precursor was also prepared by making the interconnectivity between four phloroglucinol
and one terephthalaldehyde molecules. After thermal polymerization and carbonization of the gel, the CNP had a very high surface area (1441 m2 g−1) and large pore volume (1.7 cm3 g−1) with narrow micropore (1.0 nm) and mesopore (2.3 nm) diameters. The mesopore
was developed due to the enhanced hydrogen bonding between Pluronic F127 and phloroglucinol, while the micropores were generated due to hydrocarbon polymeric network of phloroglucinol-terephthalaldehyde. The CNP had a size about ca. 20 nm. The CNP were applied for the removal of the highly
hazardous water pollutant malachite green (MG) and achieved a very high adsorption capacity (1892 mg g−1). The commercials powder activated carbon (PAC) was also applied for the removal of MG and achieved an adsorption capacity of PAC was 1390 mg g−1. It believes
that shape and size of CNP and PAC played an important role in the adsorptive removal of MG.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
·
IF 4.784
Weichuan Qiao,Hai Liu
In this study, a CotA laccase from Bacillus subtilis cjp3 was successfully immobilized onto magnetic graphene oxide (MGO) nanomaterials via covalent bonding with hydrochloride/N-hydroxysuccinimide (EDC/NHS). The morphology, structure, and properties of the MGO-laccase were then characterized by scanning-electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray-photoelectron spectroscopy (XPS), and a magnetic-property-measurement system (MPMS). The magnetic composite exhibited an extremely high binding capacity of ~145.04 mg/g and maintained maximal relative enzyme activities at 25 °C, pH 7, and a reaction time of 2 h. The pH, thermal, operational, and storage stabilities of MGO-laccase were significantly improved over those of free laccase. Moreover, MGO-laccase exhibited a higher tolerance than that of free laccase in the presence of organic solvents , inhibitors, metal ions, and salts. Furthermore, MGO-laccase showed good decolorization performance of malachite green (MG), with decolorization rates reaching 99% after 5 h of reaction at 30 °C and pH 6. In addition, the maximum saturation magnetization of MGO-laccase was 27.7 emu/g, allowing for rapid magnetic separation. Accordingly, magnetic separation allowed MGO-laccase to maintain 75% of its activity after ten consecutive decolorization cycles.
研究领域:
生物技术
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
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IF 5.9
Da Lv,Jianfeng Zhang,Ziyan Luo,Zhongde Dai,Bo Tang
Malachite green (MG) is a significant water pollutant due to its widespread use and harmful properties, making its effective removal crucial. Graphene oxide (GO) has emerged as a promising material for dye adsorption. Doping GO into cellulose aerogels enhances mechanical properties and prevents GO dissolution. Many reports claim the advantages of GO in adsorption, but challenges remain in understanding and optimizing the adsorption of MG in three-dimensional cellulosic GO (CLGO) aerogels. In this study, three-dimensional CLGO aerogels were prepared using the freeze-drying method. They achieved an MG maximum adsorption capacity of 33.98 mg g −1 , and the adsorbent still had 97.04 % adsorption capacity at the seventh adsorption–desorption cycle. The photothermal properties of the CLGO aerogels were also studied, contributing to the development of the zero-liquid discharge (ZLD) post-processing concept. Molecular force field simulations indicated that π-π interaction is the primary force between MG and CLGO aerogels in the absorption process. We believe our research will guide the future optimization of MG specialized absorbent.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
OPTICAL MATERIALS
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2022
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IF 3.754
Cailian Xia,Ruixin Lu,Qiaofeng Han
Bismuth-rich oxyiodides are promising photocatalysts owing to their unique layered structures, tunable band potentials and excellent redox ability. It is significant to explore a facile and energy-saving method to prepare Bi x O y I z -based heterojunction photocatalysts with enhanced photocatalytic performance. In this work, Bi 4 O 5 I 2 /Bi 5 O 7 I heterojunction was prepared at room temperature in the existence of thiourea (TU). The addition of TU not only reduced pH value to 6 for the generation of Bi 4 O 5 I 2 /Bi 5 O 7 I heterojunction from pH 11 in water, but also improved the photocatalytic performance. The as-prepared Bi 4 O 5 I 2 /Bi 5 O 7 I (pH 6) heterojunction exhibited superior photocatalytic activity for the degradation of tetracycline (TC) and malachite green (MG) with degradation efficiency of 89.8% and 98.2% within 120 min of visible light illumination, respectively. And the photocatalytic performance was better than those of Bi 4 O 5 I 2 /BiOI heterojunction obtained in the absence of NaOH (79.2%; 85.8%), pure BiOI synthesized without the addition of TU (pH 6) (81%; 81.4%), and Bi 4 O 5 I 2 /Bi 5 O 7 I heterojunction produced at pH 11 in water (38.7%; 85.4%). The enhanced photocatalytic activity of Bi 4 O 5 I 2 /Bi 5 O 7 I (pH 6) heterojunction could be attributed to smaller particles with higher specific surface area and high exposure ratio of (001) facet of Bi 5 O 7 I and (402) facet of Bi 4 O 5 I 2 .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2014
·
IF 3.552
Xiaomei Zhang,Hongwen Yu,Hongjun Yang,Yuchun Wan,Hong Hu,Zhuang Zhai,Jieming Qin
A simple sol–gel method using non-toxic and cost-effective precursors has been developed to prepare graphene oxide (GO)/cellulose bead (GOCB) composites for removal of dye pollutants. Taking advantage of the combined benefits of GO and cellulose , the prepared GOCB composites exhibit excellent removal efficiency towards malachite green (>96%) and can be reused for over 5 times through simple filtration method. The high-decontamination performance of the GOCB system is strongly dependent on encapsulation amount of GO, temperature and pH value. In addition, the adsorption behavior of this new adsorbent fits well with the Langmuir isotherm and pseudo-second-order kinetic model.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Biomed Research International
·
2018
·
IF 2.583
Juan Huang,Yun Yang,Yaokun Wang,Mingyang Zhang,Youxun Liu
The application of laccase-mediator-based catalysis is limited owing to the high cost of laccases and mediators and the potential toxicity of free mediators. Here, a novel biocatalyst (Im-LMS) was fabricated by immobilizing both laccase and a mediator (2,2’-azino-bis-[3-ethylbenzothiazoline]-6-sulfonic acid) on layered double hydroxide/alginate biohybrid beads. The catalytic activity of Im-LMS was evaluated for dye decolorization using malachite green. The decolorization yields of malachite green by Im-LMS and the free laccase-mediator system were 92% within 120 min and 90% within 90 min. Malachite green solution was detoxified completely after biodegradation by Im-LMS. Following eight reuse cycles of Im-LMS for dye treatment, a decolorization yield of 79% was obtained. The activity of Im-LMS was almost completely stable after being stored for 10 days. The recyclability and stability of Im-LMS will be helpful for reducing the running cost and potential toxicity associated with mediators to facilitate practical applications.
研究领域:
环境科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2024
·
IF 2.7
Runze Zhang,Kexin Liu,Fangran Jia,Tianci Xu,Yongjie Yang
Leuco-malachite green (LMG) and leuco-crystal violet (LCV) are widespread co-pollutants in aquatic products that pose a severe threat to human health. Therefore, it is urgent and challenging to develop rapid multiplex detection of LMG and LCV. Herein, the bispecific aptamer (A5b) for LMG and LCV was characterized. Its dissociation constant (Kd) was 2.03 ± 0.13 μM for LMG and 0.97 ± 0.06 μM for LCV. Then, we used A5b as a sensing probe to develop a label-free colorimetric aptasensor using gold nanoparticles (AuNPs) as an indicator and poly-diallyl dimethylammonium chloride (PDDA) as an aggregation inducer. In the absence of LMG and LCV, PDDA hybridized A5b via electrostatic interaction to form a “duplex” structure, which failed to induce the aggregation of AuNPs. However, in the presence of LMG or LCV, A5b specifically bound to LMG or LCV, releasing PDDA. The free PDDA then induced the aggregation of AuNPs. Consequently, a visible color change from red to blue was observed with increasing LMG/LCV concentration. This sensor exhibited excellent sensitivity and bispecificity, and a limit of detection (LOD) of 77.9 nM for LCV and 123.1 nM for LMG, with a linear concentration range of 1–6 μM for LCV and 1–8 μM for LMG. Additionally, the potential of this sensor for real-world applications was well demonstrated in crucian samples. Overall, this work provided a bispecific affinity probe for LMG and LCV for the first time and reported a label-free colorimetric aptasensor for multiplex detection of LMG and LCV in aquatic products.
研究领域:
分析化学
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环境科学
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食品安全
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaoyin Zhang,Jirun Zou,Xinkuo Zhang,Aixiang Wei,Ningqi luo,Zhen Liu,Jiaxiong Xu,Yu Zhao
Two-dimensional (2D) ReS 2 has received widespread attention because of its unique anisotropic properties, weak interlayer interactions and broad application prospects. Therefore, the controllable and repeatable growth of 2D ReS 2 flakes is very important for studying their properties and practical applications. In this work, 2D single-crystalline ReS 2 flakes with different layer numbers were synthesized on mica substrates using chemical vapor deposition (CVD) by adjusting the distance between the mica substrate and Re source, and the growth mechanism was further discussed. The fluorescence quenching effect and surface-enhanced Raman scattering (SERS) effect of 2D ReS 2 flakes were investigated using rhodamine B (RhB), crystal violet (CV) and malachite green (MG) dye molecules as Raman probes. The results show that the fluorescence quenching effect and SERS effect of 2D ReS 2 flakes are enhanced with decreasing layer number. The lowest detection limits on monolayer ReS 2 flake substrates are 10 −10 M, 10 −9 M and 10 −8 M for RhB, CV and MG under 532 nm laser excitation, respectively. 2D ReS 2 flakes used as a sensitive SERS-active substrate have excellent uniformity and stability. The surface Raman enhancement mechanism of 2D ReS 2 flakes was discussed.
研究领域:
材料科学
·
纳米技术
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表面化学
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分析化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）